My baby boy will be four months at the end of the month lately he has been sleeping so much more. Like yesterday my husband laid him down at round 7 he slept til 8 am!! And all day is has been taking naps and now has been sleeping for a couple hours. Is this normal is he just growing? I'm a FTM he don't seem like he's sick or anything just sleepy and he hasn't even gotten his 4 month shots yet!